iPad music based games?

[Waffle]

I'm not talking about "learn to play piano" ones, I'm talking ones like audiosurf and bit trip beat. I've gotten a good many on my iPad right now, but I'd LOVE one similar to audiosurf, if anyone knows of any that exist?
Basically, a game that bases itself off of your music, plays it as you play the game? Pretty much?

 

[Frootshoot]

Have you played Groove Coaster. You can't use your own music but it's a pretty cool music game. It's one of my favourite appa